After Justin's recent reply to a newbie about performing Rotations in Java3D, I noticed Justin's link to the J3D Org's info on quaternions. Even though i am not really involved in Java3D any longer I decided to take a peek.
When I followed the link: http://www.j3d.org/faq/manipulating.html#quaternions I saw a link to the "The Matrix and Quaternions FAQ". Since I spent a considerable amount of time looking over the Matrix and Quaternions FAQ when i was getting started in Java3D, I decided to take a look. I was completely astonished to see how outdated the version on the J3D site was and that it contained the same old fundamental errors and even contradicts itself.. Since I spent such a large amount of time fighting with the differences between what the Java3D API actually did and what the "The Matrix and Quaternions FAQ" said it should do, I feel that it is a huge mistake to keep these mistakes out there in the public domain and perpetuate the same problems on novices when we should be providing guidance to them. Andreas Junghanns maintains an up-to-date version at: http://www.cs.ualberta.ca/~andreas/math/matrfaq_latest.html Mona Wong had one at: http://ncmir.ucsd.edu/~mona/matrfaq.html but it seems to be down. Justin, PLEASE FIX THIS. Thanks. *********************************************************************** Eric N. Reiss MEMS Manager Swanson Center for Product Innovation Department of Mechanical Engineering School of Engineering - University of Pittsburgh 3700 O'Hara Street 647 Benedum Hall Pittsburgh, Pennsylvania 15261 Phone: 412-624-9696 FAX: 412-624-7701 Email: [EMAIL PROTECTED] http://www.sigda.org/Eric/ *********************************************************************** =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
